Remove obsolete Kanban parts.

templates/admin_projects.html

@@ -93,7 +93,6 @@
                     <td class="actions">
                         <a href="{{ url_for('edit_project', project_id=project.id) }}" class="btn btn-sm btn-primary">Edit</a>
                         <a href="{{ url_for('manage_project_tasks', project_id=project.id) }}" class="btn btn-sm btn-info">Tasks</a>
-                        <a href="{{ url_for('project_kanban', project_id=project.id) }}" class="btn btn-sm btn-success">Kanban</a>
                         {% if g.user.role == Role.ADMIN and project.time_entries|length == 0 %}
                         <form method="POST" action="{{ url_for('delete_project', project_id=project.id) }}" style="display: inline;"
                               onsubmit="return confirm('Are you sure you want to delete this project?')">